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The types of marine organisms in the world account for 80% of the world's biological species. Aquatic medicine refers to medical supplies made from the body extracts of aquatic animals and plants. A variety of medical supplies can be extracted from fish. For example, cod liver oil containing vitamins A and D extracted from cod liver has been used in the medical field for many years. Insulin extracted from the pancreas of fish and whales has been used clinically, while fish scales also produce medicinal gelatin (isinglass). A variety of medicinal products can be extracted from fish. For example, cod liver oil containing vitamins A and D extracted from cod liver has been used for many years. Sodium cod liver oleate further extracted from cod liver oil can be used to treat varicose veins, internal hemorrhoids and hemangioma of lower extremities, and has a significant hemostatic effect. Insulin extracted from the pancreas of fish and whales has been used clinically. Protamine is extracted from protamine and combined with insulin to make protamine zinc insulin, which can prolong the efficacy of insulin in lowering blood sugar. Guanine extracted from fish scales can be used to make caffeine. In addition to fish, the chitin contained in shrimp and crab shells can be used as drug synergists, wound healing agents and raw materials for making artificial kidney semipermeable membranes. The Limulus reagent made from Limulus blood is used to test endotoxin, and the effect is particularly sensitive and rapid. The most widely used algae in medicine are brown algae and red algae. Brown algae has long been used as a traditional Chinese medicine for the prevention and treatment of goiter and high blood pressure.